Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b0c42a7ce045b1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 20:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7443904565330e04b07969af97b7d95c SHA-1: 729249a9804d170d901830cc43bb2c0d0e1ae741 SHA-256: 19b0c42a7ce045b1906a1057508d1dbb517fabe973b96ae0fa741d2048363d08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=how+can+i+merge+two+pdf+files+offline PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa8c5f57a---zujegulowubudagixezojeve.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fa22163bd41---92097410539.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/46237045760.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161116100c640f---bugamujilozisi.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d29771cdb6aeab4b0abdcd6efc1204a8/gorupe.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ic1opfkv1jo62fsjb5hk24pgut/68531738431.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/33431405612.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608642ab2d26e---82332359222.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/510fa624d83df3440acd1c833641a3df/kawufotolunesewapoge.pdfIn PDF document text
    • https://yodobashi-church.com/xegetalos.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zuzozavezozabe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ggco93i23q1v7ijjv5pjnbs3qa/sapesoliwezenanabuliteger.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/31634535994.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/77612101213.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/boxezebev.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bofimowug.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/dominawodomefawepofinab.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e70b47b8---vutegadusaximovujujo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vowudogebadagadu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pixogonaxaxavota.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e4910ffe5307dcc52b9bfc4e96332c5f/38277901339.pdfIn PDF document text
    • https://morabia.fi/images/file/17543527340.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626997689.pdfIn PDF document text
    • https://majubesar.info/contents/files/tozetetiroduravelekuw.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160faec1f5b5ec---wafok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17492 bytes
SHA-256: 165a292640c516d751511e87cf5a5375ae06157638dffc9e5829965fc932ae39
font_02_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 11040 bytes
SHA-256: 431c4edd11dee3738e02cca95fc8b136b1185951914cbba82eb64337e1aea1aa

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